Frequently Asked Questions

How To Install    Choosing Your Tubing    Selecting Your Fittings    Measuring Your Filament    Safety Precautions

Q: Can I use the stock fittings with Capricorn tubing?

A: Yes, you can re-use the original fittings that came with your printer, as long as they weren't damaged during removal. We recommend replacing them for best performance however.

Q: Which of your premium Bowden tubes is right for me?

A: That depends on your particular application. For help in choosing, please see our Product Selection page.

Q: Can I print X in my Y printer with your tubing?

A: This question has as much to do with safety as it does whether it physically "will work." Please read our Safety Page for a more in-depth answer.

Q: I placed an order from Capricorn forever ago, but my package hasn't arrived yet.

A: Deliveries using our standard shipping options should take no more than 3 days within the USA, or 21 days internationally. If this time has been exceeded, please check the tracking information first. (You should have received an email with the tracking number when the item was shipped.)

If it says the package has already been delivered, check with your neighbors or other people in your building who may have signed for it. We find that almost every single time, the package eventually turns up.

If you believe the package was stolen, or something else out of the ordinary happens, we can ship you a replacement.

Q: I'm a bit puzzled by your offerings for 2.85 mm filament.
For your 1.75 mm filament you reduced the inner diameter to reduce filament backlash and therefore improve print quality. For 2.85 mm filament you increased the inner diameter. I'd expect with the larger volume per unit length of 2.85 mm filament that this would exacerbate changes in nozzle pressure and make the effects of filament backlash worse.
Will you be releasing a version with a smaller ID?

A:Thanks for asking. We ended up going with 3.2mm ID, which is what Ultimaker uses, after a number of trials of other sizes. This is actually much tighter than most 2.85 tubing which is 4.0mm ID. We found that with the additional stiffness of the thicker filament, reducing the diameter any further caused too much friction, and did not work reliably.

Q: Since installing your tubing, my prints are under-extruding, having layer gaps, or failing entirely.

A: There are numerous things that can cause these types of issues. Check your extrusion multiplier, make sure the temperature is high enough, and make sure you don't have a jam in your hot end (which can sometimes be caused by not getting the tube seated flush.)

After installing a new Bowden tube, there will always be a period of tuning required to get everything re-dialed-in. Try adjusting the print speed, retraction speed, making sure the extruder gears are clean, and the nozzle isnt clogged.

Before jumping to the conclusiong that the tubing is too narrow, please first measure the diameter of your filament. Use a calipers to check the diameter at several points. Sometimes a filament will measure 1.72mm for example, so you think its good to go, only to then measure 1.83 for example, a few meters down the line.

It is extremely important to use properly sized filament with our XS series tubing, because of the smaller internal diameter. Swapping out your cheap off-brand filament for something more reputable may seem like it costs more, at first, but the reduction in waste from failed prints will more than pay for itsself.

Q: Ever since I installed your tubing, my extruder is making clicking sounds, why?

A: Extruder clicking is generally the result of gear slippage caused by excess pressure in the filament. It could be that you need to adjust your retraction up or down, fine tune yor retraction speed, or increase the nozzle temperature by a few degrees.

Also this is a good time to make sure your extruder gears are clean. You may have knocked some plastic shavings loose while doing the install. Junk in your gears can cause slippage/clicking as well.

You may find that you need to fine-tune your temperatures, retraction settings, and extrusion multiplier, etc, after installing a new Bowden tube, to get everything dialed back in.

Q: Since I began using Capricorn tubing, my nozzle is jamming! Help!

A: Most of the time this is because the tubing was not seated well in the hot end. Carefully remove the tube, and use a razor blade to cut the end perfectly square. If possible, install a new fitting, to make sure it will hold the tube tightly. Use a peice of the old tubing to check the depth, and mark your Capricorn tube with a Sharpie so you know how deep you are expecting it to go. With one smooth motion, inster the tube into the fitting, and use a C-clip to hold the fitting secure.

Q: After installing your tubing, my Bowden fittings are wiggling or moving back and forth, whats going on there?

A: No amount of fitting movement is good. Some people live with one to two millimenters of movement, but ultimately this is going to reduce the quality of your prints.

Fittings are not made to be repeatedly connected and disconnected, and they wear out quickly sometimes. Usually, you need to replace the fitting. If you ordered it from our store, let us know and we will happily send you a replacement.

If your fitting is a common size, we may have already begun selling them in our shop. If we don't have it listed, please email us with the type of printer and hot-end you are running, and which fittings you need. We will add it to our ever expanding list of fittings to carry in our shop.

Q: What is the big deal with Bowden Drive?

A: Bowden systems allow the extruder motor to be mounted away from the hot end, reducing the amount of moving mass. This allows printing at higher speeds and reduces "z-ringing" and other artifacts caused by internal vibrations in the machine.

Q: What about Flying Extruders and Direct Drive systems?

A: Even a flying extruder uses a Bowden tube. It will be shorter, potentially producing better results with flexible filaments. This is primarily apparent with larger printers. Our tubes can even be used for Direct Drive systems, for what's known as a 'reverse Bowden' or 'filament guide' meaning the Capricorn Bowden Tube feeds the filament from the spool to the extruder motor. This is the default on some direct drive printers, and has advantages such as being able to route the filament around corners without breaking it.

Q: What makes a Capricorn Bowden Tube better?

A: Check out our Technical Specifications Page for the nitty gritty numbes.

Q: Where can I buy Capricorn Bowden Tubes

A: As of June 2017, you can purchase our products through our website, as well as Filastruder. We plan to launch on Amazon and additional resellers soon.

Q: How do I cut and install my new Bowden Tube

A: Check out our How To Page for further instructions.

Q: How can I sell Capricorn products in my own retail shop or website?

A: We would love to do business with you! Please contact for wholesale pricing.

How To Install    Choosing Your Tubing    Selecting Your Fittings    Measuring Your Filament    Safety Precautions