How to Choose Your Fittings

Fittings tend to wear out and loose teeth, so its never a bad idea to swap in new ones when you change your Bowden tube.

What are the differences between them?

First, the size of the tubing it accepts. Bowden tubes for 1.75mm filament are 4mm outer diameter. Part numbers beginning with PC4 indicate "Push Connector 4mm"

The next difference is threading. Most Bowden systems use either an M6 ("Metric 6mm"), M5, or M10 thread. 01 Threading is also common, which is a 1/8 inch NPT thread. The distance between the threads is called the pitch.

The third thing to look for is whether the fitting allows the tube to pass all the way through. We now carry 01NPT and M10 threaded fittings in both styles. Note that some fittings can be modified to allow the tube to go all the way through by careful drilling. For 1.75 tubing, use a #19 (4mm) drill bit. For 2.85 tubing, use a 1/4" drill bit.

Which fitting is right for me?

The easiest way it to look closely at the pictures, paying close attention to the measurements. We are working to build a list of printers for each fitting size, but it isn't complete yet. Please help us out by emailing or tweeting at us, and let us know what printer you're running, and what fittings it uses.

Don't see your printer listed here? Help us build our database by emailing support@captubes.com or tweeting @CapTubes with pictures and measurements of your fittings.

Fitting (Size-Thread)
PC4-M6 PC4-M6 fittings feature a 4mm opening, and M6 threading with a 1.0mm pitch. This is our most popular fitting, used by the Creality CR-10 (extruder end), and many of the newer RepRap printers. Note that this fitting does not allow the tube to pass all the way through. We also carry a PC4-M6-C, which is a more compact, lightweight version.
PC4-M6-C This is the Compact, lighter weight version of the PC4-M6. They feature a 4mm opening, and M6 threading with a 1.0mm pitch. Packed into a sleek housing measuring only 8 mm in diameter and 16 mm long (compared to 10x20mm for the full size version.)
PC4-M10x0.9-4.1 *New in stock 8/2018* The M10 threaded fitting with 0.9mm pitch is used by the Creality CR-10 at the Hot End side. It has a 4.1mm opening at the back end that allows the tube to pass all the way through to the hotend.
PC4-M10x1.0 and PC4-M10x0.9 M10 threaded fittings available with 0.9 and 1.0mm pitch, for 4mm tubing. This is used in some of E3D's hot ends, and TEVO printers. Note that there are several versions of the M10 fittings. Be sure to check the pitch of the threads for the best fit.. These do NOT allow the tube to pass all the way through, like the CR-10. (those are above) M10x0.9 fittings can also be used on the CR-10 by cutting an additional piece of PTFE to go on the other side of the fitting, down into the hot-end for a 'quick disconnect' style set-up similar to the Monstah adapter.
PC4-M5 This is another common size for RepRaps, and is utilized in the Monstah Adaptor for the popular HE280 hotend. It has a 0.9mm pitch M5 thread, and does not allow the tubing to pass all the way through.
PC4-01 NPT This fitting has an 1/8 inch NPT thread. This is similar to an M10 except with a slight taper. 01 and M10 threads are so close that they can often be used interchangeably. Note that these do not allow the tube to pass all the way through. )
PC4-01 NPT-4.1 This fitting has an 1/8 inch NPT thread. This is similar to an M10 except with a slight taper. 01 and M10 threads are so close that they can often be used interchangeably. This version has a 4.1mm back end that allows the tube to pass all the way through to the hotend. These are used in the Stacker S4 printer. )
PC6-M10 This is an M10 threaded fitting for our 6.35mm tubing, for 2.85mm filaments. Note that these do not allow the tubing to pass all the way through.
PC6-M10-6.2 This is an M10 threaded fitting for our 6.35mm tubing, for 2.85mm filaments. Pre-drilled to allow the tubing to pass all the way through. Please Note: we have marked these out-of-stock as of 2019.
Monstah Adapter Direct from Mastermind Sarah from New Zealand; we introduce you to the Official Monstah Adapter. Working with Sarah, Capricorn is your Premiere North American distributor. Only seems “fitting” we pair the adapter with our premium XS tubing to provide the best defense against the infamous HE280 puck! What is the HE280 puck? If you’re unfamiliar with the HE280, it’s a hotend offered by another wonderful Hoosier company, SeeMeCNC; unfortunately, it can be a challenge to get the PTFE tube seated properly against the heat break to prevent pooling of plastic from forming, aka the dreaded puck! The puck leads to feeding inconsistencies, jamming, and loads of colorful words shouted over another failed print. Time to “Scare the Puck Out!” and outfit your HE280 with an Official, Capricorn XS enhanced, Monstah Adapter!

What if I accidently purchase the wrong fittings?

Please contact support@captubes.com and we will provide instructions to return the un-used fittings for an exchange or refund.

What if you don't carry the fitting I need?

We are constantly expanding our selection to meet the needs of the community. Please tweet us @CapTubes or email support@captubes.com with your printer or hotend, and the specs of the fittings you need.