Buying guide
Printer Maintenance Kit
Updated How we research
Keep your machine running like new. The page is split into five sections (Replace aging tubing; Keep spare thermistors; Swap heater cartridges; Refresh the extruder gear; Check the heat block), followed by every pick ranked by our score so you can compare them in one place.
The short version
We compared 20 picks. Our scores range from 7.0 to 8.6 out of 10.
- Best overall:Sovol Capricorn PTFE Tubing 1M XS 1.75mm + 2X PC4-M6 & 2X PC4-M10 Fittings + Cutter for Ender 3. Highest overall score in this guide at 8.6/10.
- Also great value:HICTOP Ender 3 Thermistor with JST Connector 1.35m NTC 3950 100k Temp Sensor (Pack of 5). Value score of 9/10, overall 8.4/10.
- Solid build:Capricorn Bowden PTFE Tubing XS Series 1 Meter for 1.75mm Filament (Genuine Premium). Build and materials score of 9/10, overall 8.1/10.
- Feature-rich:2-Pack NTC 100K B3950 Thermistor OD3mm Cartridge Sensor 280C for Ender 3 V2 CR10 V6. Features score of 8/10, overall 8.4/10.
Scores are our editorial assessment, not customer ratings. How we score
Replace aging tubing
- Sovol Capricorn PTFE Tubing 1M XS 1.75mm + 2X PC4-M6 & 2X PC4-M10 Fittings + Cutter for Ender 3Our score8.6/10
- Capricorn Bowden PTFE Tubing XS Series 1 Meter for 1.75mm Filament (Genuine Premium)Our score8.1/10
- Creality x Capricorn PTFE Tube for 1.75mm Filament, 1 Meter Low Friction Bowden Tubing, 3D Printer Extruder Feeding Tube Compatible with Ender 3 V3 SE, K1, K1C, K2 Series, CFS, BufferOur score7.8/10
- Creality Official Teflon Tube 2M, 2.5mm ID 3D Printer PTFE Bowden Tubing Support 1.75mm Filament Heat Resistant for K2 Plus, K2 Series, CFS, K1C, K1 SE, K1 Max, K1, Ender 3 V3 Series, Ender 3 SeriesOur score7.2/10
Keep spare thermistors
- HICTOP Ender 3 Thermistor with JST Connector 1.35m NTC 3950 100k Temp Sensor (Pack of 5)Our score8.4/10
- 2-Pack NTC 100K B3950 Thermistor OD3mm Cartridge Sensor 280C for Ender 3 V2 CR10 V6Our score8.4/10
- HiLetgo 10pcs 3D Printer 100K ohm NTC 3950 Thermistors Sensors with 1m Cable for RepRapOur score7.6/10
- 12V 40W Ceramic Cartridge Heater and 3950 100K NTC Thermistor for Anet 3D Printer (4pcs)Our score7.0/10
Swap heater cartridges
- HICTOP Ender 3 Heater Cartridge 24V 40W 1M for Creality Ender 3 Pro Ender 5 CR-10S Pro (3pk)Our score8.2/10
- DIRECT IGNITER 3x Cartridge Heater Upgrade 24V 40W for Prusa Reprap Printer Extruder 6x20mmOur score7.8/10
- Ewigkeit 24V 40W Heater Cartridge 620 Ceramic Hotend for 3D Printer Prusa Mendel (5pcs)Our score7.6/10
- Signswise 5pcs Reprap 24V 40W 620 Ceramic Cartridge Heater for 3D Printer Prusa MendelOur score7.6/10
Refresh the extruder gear
- MK8 Extruder Gear, 10 Pieces Brass Drive Gear for MK7 MK8 Extruder 26 TeethOur score7.8/10
- 3D Printer Drive Gear 10pcs Brass Worm Gear Wheel for MK7 MK8 Extruder (26 Teeth)Our score7.6/10
- 3D Printer Drive Gear 10pcs Brass Worm Gear Wheel for MK7 MK8 Extruder (40 Teeth)Our score7.2/10
- fosa 10PCS Brass Extruder Wheel 40 Teeth Drive Gear for MK7 MK8 ExtruderOur score7.2/10
Check the heat block
- Ender Silicone Socks/Aluminum Heater Block/Stainless Throat for MK7 MK8, Ender 3/CR-10 (3 Packs)Our score8.2/10
- Creality Original Aluminum Heater Block for MK7 MK8 Extruder, CR-10/S4/S5, Ender 3/Pro (Pack of 5)Our score7.8/10
- 2-Pack CR-10 Heater Block for Creality All Metal Hotend Ender 3s/Pro Ender 5 Pro CR10 (Aluminum)Our score7.6/10
- Wangdd22 5PCS V6 Volcano Aluminium Heater Block for E3D Volcano Print Head Hot EndOur score7.0/10
All 20 picks, ranked by our score
Every product from the sections above, listed once. Sort by the criterion you care about most, or tick up to three to compare.
#1Sovol Capricorn PTFE tubing 1M XS for 1.75mm with 2X PC4-M6, 2X PC4-M10 fittings and a cutter for Ender 3.
Fit for the job 9/10 · Features and specs 9/10 · Build and materials 8/10 · Value 8/10
- + PC4-M6 and PC4-M10 fittings replace worn couplers in one go
- + Included cutter makes the square tube ends needed to avoid gaps
- + XS tubing tightens the filament path for cleaner retraction
- - Check that fittings match your hotend and extruder thread sizes
- - Capricorn from resellers can be hard to verify as genuine
#2HICTOP Ender 3 thermistors with JST connector, 1.35m NTC 3950 100k temp sensors in a pack of 5.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 9/10
- + 1.35m lead length reaches the mainboard on Ender 3 wiring runs
- + JST connector plugs straight into stock Ender boards
- + Pack of 5 covers hotend and bed sensor replacements
- - Thermistor glass beads are fragile and break if pinched when installed
- - Firmware must be set to the matching thermistor type to read correctly
#3A 2-Pack of NTC 100K B3950 cartridge thermistors, OD3mm and rated to 280C, for Ender 3 V2, CR10 and V6 hotends.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 8/10 · Value 8/10
- + Cartridge style is sturdier than bare glass bead thermistors
- + 280C rating covers PETG, ABS and many nylon filaments
- + OD3mm size fits V6 and newer Creality heater blocks
- - Older blocks with bead holes will not accept cartridge sensors
- - Check the connector matches your board before wiring it in
#4HICTOP Ender 3 heater cartridge 3pk at 24V 40W with 1M leads for Ender 3 Pro, Ender 5 and CR-10S Pro.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 1M leads reach Ender and CR-10S Pro mainboards without extensions
- + 3pk offers spares for the printer and a backup machine
- + 24V 40W spec matches Creality stock heater output
- - Connectors may need swapping to fit specific board terminals
- - Only 3 pieces compared with larger 5 piece heater packs
#5Ender silicone socks, aluminum heater blocks and stainless throats for MK7 and MK8, sold as 3 packs for Ender 3 and CR-10.
Fit for the job 9/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + Silicone socks, blocks and throats cover a full hot end rebuild
- + Stainless throats resist heat transfer better than aluminum ones
- + 3 packs let you repair more than one printer or keep spares
- - Stainless throat may still be PTFE-lined, so check high-temp use
- - Socks can be a loose fit if the block dimensions differ
#6Genuine Capricorn XS Series Bowden PTFE tubing, 1 meter for 1.75mm filament, a low-friction upgrade for Bowden printers.
Fit for the job 9/10 · Features and specs 7/10 · Build and materials 9/10 · Value 7/10
- + Tight inner diameter improves retraction control on Bowden printers
- + Genuine premium Capricorn resists heat better than basic PTFE
- + 1 meter length covers a full Bowden run on Ender-style printers
- - No fittings or cutter included, so old couplers must be reused
- - Only useful on Bowden setups, not direct drive printers
#7Creality x Capricorn XS PTFE tube for 1.75mm filament in a 1 meter length. Low friction tubing rated to 300 C and listed for the Ender 3 V3 SE, K1, K1C, K2 series, CFS and buffer feed paths.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Official Creality listing of Capricorn premium XS tubing with a precise, consistent inner diameter
- + Rated to 300 C, which the listing recommends for ABS, nylon and polycarbonate
- + Compatibility list covers the Ender 3 V3 SE, K1, K1C, K2 series, CFS and buffer
- - A bare 1 meter length: the title names no cutter or fittings
- - One meter leaves little spare after a full-length feed run, and longer runs need the 2 or 3 meter size
#8DIRECT IGNITER 3x cartridge heater upgrade at 24V 40W in 6x20mm size for Prusa RepRap printer extruders.
Fit for the job 8/10 · Features and specs 8/10 · Build and materials 7/10 · Value 8/10
- + 6x20mm size is clearly stated, so block fit is easy to check
- + 3x heaters provide backups for common hotend failures
- + 24V 40W output suits standard RepRap and Prusa style hotends
- - Upgrade claim is vague beyond the listed voltage and wattage
- - Leads may need trimming and new connectors for tidy wiring
#9MK8 extruder gear pack of 10 pieces, brass drive gears with 26 teeth for MK7 and MK8 extruders.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 9/10
- + 26 teeth size matches the stock drive gear on many Creality extruders
- + 10 pieces keep spares ready when teeth fill with plastic dust
- + Brass drive gear grips filament firmly for consistent feeding
- - Brass teeth wear faster than hardened steel with abrasive filament
- - Check shaft bore and grub screw fit against your motor
#10Creality original aluminum heater block pack of 5 for MK7 and MK8 extruders on CR-10, S4, S5 and Ender 3 Pro.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 8/10 · Value 8/10
- + Pack of 5 covers repeated repairs after blobs or damaged threads
- + Original Creality blocks match stock heater and thermistor holes
- + Fits a wide range of CR-10 and Ender 3 Pro printers
- - Aluminum blocks lose heat without a silicone sock fitted
- - Five blocks is more than most single-printer owners will use
#11HiLetgo 10pcs 100K ohm NTC 3950 thermistor sensors with 1m cable for RepRap-style printers and DIY builds.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 9/10
- + 10pcs pack is ideal for tinkerers maintaining several RepRap machines
- + NTC 3950 100K is the most common thermistor type in firmware tables
- + 1m cable is long enough for most hotend and bed wiring runs
- - No connector fitted, so crimping or soldering is usually needed
- - Bare bead sensors break easily if the leads are bent sharply
#12Ewigkeit 24V 40W 620 ceramic heater cartridges for Prusa Mendel style hotends, sold as a 5pcs spare set.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 6/10 · Value 9/10
- + 24V 40W rating matches most modern RepRap and Ender hotends
- + 5pcs pack covers several heater failures or multiple printers
- + Ceramic cartridge design is a standard drop-in replacement
- - Bare leads may need connectors crimped for your mainboard
- - Generic cartridges can vary slightly in diameter and fit
#13Signswise 5pcs RepRap 24V 40W 620 ceramic cartridge heaters for Prusa Mendel printers and similar hotends.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + Long-running listing is a familiar choice for RepRap builders
- + 5pcs of 24V 40W heaters keep spares ready in a parts drawer
- + Ceramic construction heats consistently in standard aluminum blocks
- - Check the wire length reaches your board on larger frames
- - Older listing may lack insulation sleeves on the wires
#14Brass worm drive gear wheels, 10pcs with 26 teeth for MK7 and MK8 extruders, a common stock-size replacement.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 26 teeth gear is a like-for-like swap on many stock extruders
- + 10pcs gives years of replacements for a single printer owner
- + Keeps extrusion steady after an old gear gets clogged or worn
- - Same seller style as the higher tooth count version, so order the right count
- - No hardened coating, so abrasive filament shortens gear life
#15A 2-Pack of aluminum CR-10 heater blocks for Creality all metal hotends on Ender 3s, Pro, Ender 5 Pro and CR10.
Fit for the job 8/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 2-Pack gives a spare for fast repairs after a filament blob
- + Fits Creality all metal hotends used across Ender and CR10 models
- + Aluminum blocks heat up quickly with stock heater cartridges
- - Aluminum threads strip more easily than copper if overtightened
- - Only two blocks, so frequent tinkerers may want more
#16Creality official PTFE tube, 2 meters long with a 2.5mm inner and 4mm outer diameter for 1.75mm filament. Listed for K1, K2, CFS and Ender 3 V3 series filament paths, heat resistant to 260 C.
Fit for the job 7/10 · Features and specs 6/10 · Build and materials 7/10 · Value 9/10
- + Official Creality part listed for the K1 series, K2 Plus, CFS and Ender 3 V3 series printers
- + 2 meter length gives enough tube for several replacement runs cut to size
- + Rated to 260 C and listed for PLA, PLA+, ABS, PETG and TPU filament
- - 2.5mm inner diameter is wider than the 1.9mm Capricorn tubes, so confirm your printer calls for this bore
- - The title lists no cutter or fittings, so plan on having those already
#17Brass worm drive gear wheels, 10pcs with 40 teeth for MK7 and MK8 extruders on common FDM printers.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 40 teeth gear gives fine grip spacing on filament surfaces
- + 10pcs supply covers multiple printers or frequent replacements
- + Brass is easy to clean with a small brush after grinding
- - Tooth count must match the extruder's steps-per-mm setting
- - Brass wears faster when printing glow or carbon filled filaments
#18fosa 10PCS brass extruder wheels with 40 teeth drive gears for MK7 and MK8 extruders on budget printers.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 7/10 · Value 8/10
- + 40 teeth design suits extruders built around finer tooth spacing
- + Brass drive wheel grips PLA and PETG reliably when clean
- + 10PCS pack keeps a steady spare supply at low cost
- - Grub screw flat must align with the motor shaft to avoid slip
- - Brass teeth clog with debris and need periodic brushing
#19A 4pcs set of 12V 40W ceramic cartridge heaters and 3950 100K NTC thermistors for Anet printers.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 6/10 · Value 8/10
- + Heater and thermistor pairs fix the most common hotend failures
- + 12V 40W spec matches older Anet printer power systems
- + 4pcs gives spares for more than one repair job
- - 12V heaters will not suit higher-voltage printers like newer Ender models
- - Anet-specific connectors may not fit other brands' boards
#20Wangdd22 5PCS V6 Volcano aluminium heater blocks for E3D Volcano print head hot ends and high-flow setups.
Fit for the job 7/10 · Features and specs 7/10 · Build and materials 6/10 · Value 8/10
- + Volcano blocks allow long melt zones for large nozzles and fast flow
- + 5PCS pack supplies spares for Volcano conversions and repairs
- + Low-cost aluminium blocks suit experimentation with high-flow printing
- - Requires Volcano-length nozzles, not standard V6 nozzles
- - Generic brand tolerances may affect heater cartridge fit
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Filament Print Lab curates picks for US shoppers. Scores are our editorial assessment. We may earn a commission from links on this page.