Saintflint Extruder

Not your mother's extruder! Kidding... This simple yet very effective extruder is the brainchild of some members of the QR's community (Shauki, Exilaus & Dale Dunn). I just tried to put it in a pleasant form. The name comes from the ring that looks like an aureola and it uses a coil from a lighter.

3D printer parts and enhancements

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This is an original design of an extruder that has the following features:

- Symmetrical load on stepper axis;

- Adjustable filament pressure without spring;

- Simple & open design (easy to see what's happening inside);

- No need for a geared reducer, direct drive;

- Support flexible filament (anti-buckling support on both extrusion and retraction);

- Best bang for your buck;

See it in action:

Files for modification are publicly available and with a free Onshape account here:

For details about fitting the coil on the stepper motor, you can find them by looking for #bicgear , #saintflint or #flintfeeder on Google Plus.

05-09-2015 Uploaded some variation on the current design, namely:

- MK8 gear based version

- NEMA14 based version (uses smaller 625 bearings). This last version should perform very well as a "suspended" extruder on a delta with a short bowden. Very light yet powerful enough to get along with the speed.  

Materials and methods

- 1 Coil flint from a BIC or Mini-BIC lighter;
- 4 Shims w/ inner diameter > 5 mm (I used rolls from a used bicycle chain;
- 1 screw M3 5 mm length
- MK8
- PTFE liner 40 cm;
- 2 608 bearings;
- 2 screws M3 20 mm length;
- 3 M4 nuts to secure the PTFE line (2 for the loop and 1 for the start of the bowden line to the hot-end);
- 1 Step motor NEMA 1.7A (or even lower);



Issues are used to track todos, bugs or requests. To get started, you could create an issue.


Mini henrytottoHenryTOtto added this to the A collection ago
23309da56ec275cf81f244abe4271360?default=blank&size=40Emerson Jhones added this to the extruders collection ago
Mini jessietmitchellJessieTMitchell added this to the a collection ago
657d106d49f8358163acba8b1f3b6735?default=blank&size=40Lucas Brígida added this to the Make collection ago
617bb6ae8db86a8564cdea4445304da8?default=blank&size=40Alexandre Parra Betioli added this to the Printers collection ago
Mini poza cdn patrataSabin Iacob commented ago

I added a mk11 version (luckily onshape is similar enough with freecad for me to find my way around it; cringy service otherwise, asking for phone numbers and stuff...)

39cf1a7beb5fee20507fe0e33c5ed613?default=blank&size=40Sergey Mukhortov added this to the M-prime collection ago
E5e8d2d5a46c9c2407c068c3a0a458a2?default=blank&size=40mongrelfab added this to the filament collection ago
05de1f9f31d4a68babb6d17e8b06d9e8?default=blank&size=40Sean B added this to the Functional Prints collection ago
Mini lisca mangaLisca added this to the 3D Printer Parts collection ago
Mini 3davatarPaulo Rodrigues added this to the 3D Printer Extruders collection ago
1b73492eb735f00a66beb642d4054a99?default=blank&size=40nnm added this to the Extruders collection ago
E271630f128a06b231c749fd34b3e54a?default=blank&size=40Saverio Palmieri Neto added this to the Things to print collection ago
0c45fd306ccdb3458f404a5f668e2b52?default=blank&size=40Ruslan added this to the 1 collection ago
Dffbb8a1a1b7dd668cfc28e739fe8a74?default=blank&size=40SphereCo added this to the Printer_Parts collection ago
Cf229c42eb9eed3d56208d5ef1debd56?default=blank&size=40ckaos commented ago

Thanks a lot , will take it for a spin :)

Mini logoErich HaHaOh commented ago

Thanks for your help Michael !

Mini joconde jarjar squaremmemetea commented ago

I meant mk8, not mk7... Sorry.

Mini joconde jarjar squaremmemetea commented ago

I just uploaded an MK7 version. It should work, please confirm as I don't have any.

The only trouble you could run into would be due to some contact between the non-hobbed part and the conical part. Let me know if it's ok.

You should reach 150 mm/s without problem (my printer isn't rigid enough to reach this speed in a usable way but I will try for the sake of it).

Mini logoErich HaHaOh commented ago

Is your Extruder usable for MK7/8 Gears?Not the lighter Gears from Shauki)

Great Invention! Thanks for sharing!

Cf229c42eb9eed3d56208d5ef1debd56?default=blank&size=40ckaos commented ago

Very nice design !

Two small questions:

- what is the maximum speed you tried it on ? (looking for something that can possible manage 100-150mm/s without too much trouble)

- can you also use something other than a flint, ie an MK8 etc ?

Mini joconde jarjar squaremmemetea commented ago

Printing speed usually 70 mm/s - Retraction 3 mm @ 40 m/s - Works flawlessly for far.

The tricky part is really to install the flint correctly.

09ad9f3fa3d73653d05a3489852c6deb?default=blank&size=40rsenas commented ago

Great!!! What speed settings? Retraction and had never seen such a brilliant idea and a motor pulls it right? And again thank you for providing. Big hug.

Ef2e9a8ca92e06f7a44f4d489bbac06b?default=blank&size=40sniglet printed this ago
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Mini joconde jarjar squaremmemetea published this design ago