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07-20-2019, 12:05 PM   #46
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A couple of you have mentioned the Bahtinov mask for use in photographing stars. Here's an stl code for a 150mm mask which can be easily resized in Cura when generating the gcode file for printing. A png is included showing the mask. The mask will also work if 2D printed on clear media (not translucent) making a film version which can be placed in front of a lens. The stl will result in a flat (2mm thick) mask which may need a retainer rim to hold it for a given lens. If sized properly, it will fit in a filter ring (use a spare UV or Haze filter).

Thanks to arach101 for putting me on to Fusion360 which was used to generate the mask. Fusion360 is free if you go through all the registration process and declare yourself an educational or hobby user, but it's not the smartest program on the block in some ways and is a bear to use offline because it takes so long to boot (not fast booting on line either). It is however, a very useful and feature filled 3D modeling program which converts generated models to stl format easily. Those can then be used directly in Cura to create the gcode files for many 3D printers.

Attached Files
File Type: zip 150mm Mask (497.4 KB, 19 views)

Last edited by Bob 256; 07-20-2019 at 12:15 PM.
03-01-2020, 09:13 AM   #47
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I printed this K-mount to telescope eyepiece adapter a few months ago. I did a bit of testing and it works, although the resulting photos are just okay. Which I should probably expect using my kid's $50 400mm equivalent telescope.
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PENTAX K-30  Photo 
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PENTAX K-30  Photo 
05-08-2021, 05:29 AM - 5 Likes   #48
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List of collected Pentax related 3D printable goodies

List of collected Pentax related 3D printable goodies:
  1. Pentax 31mm 1.8 Cokin P Filter adapter: Pentax 31mm 1.8 Cokin P filter adapter by Arachnorchis - Thingiverse
  2. Pentax/Tamron 15-30mm 150mm filter adapter: Tamron - Pentax 15-30mm 2.8 150mm Filter adapter by Arachnorchis - Thingiverse
  3. Cokin P filter holder: Cokin P 84mm 100mm and 150mm filter holder by Arachnorchis - Thingiverse
  4. Magnetic filter mount: Magnetic 100mm and 150mm filter mount adapter by Arachnorchis - Thingiverse
  5. USB charger for Pentax D-Li90 batteries: Camera Battery Phone Charger by walter - Thingiverse
  6. NATO/Picatinny Rail for Hot Shoe by Bikecyclist - Thingiverse
  7. Flash Hot Shoe Picatinny Rail (2 Slots) (5VS74B67J) by cynosurex
  8. D-LI90 battery contact cover (like with the old D-LI50 batteries):
  9. Q Lens focus Lock utility: 03 Lens: Focus lock helper -
  10. Project to modify battery chargers for Panasonic batteries to fit Pentax D-LI90 (idea later used by somebody): Hähnel PROCUBE2 - 3D printed adapter for Pentax D-Li90 -
  11. Pentax D-Li90 battery cap by pentaglut - Thingiverse
  12. Pentax K-r DSLR Battery Pack Cover by donutman_2000 - Thingiverse
  13. Pentax MX Grip: 3DPrinting a MX Grip -
  14. K-mount to telescope eyepiece adapter: Pentax K-mount SLR to 1.25" telescope eyepiece adapter by xzivr - Thingiverse
  15. Pentax 645 Battery Holder -
  16. Tripod mount foot for F* 250-600mm by StigVidar: Microsoft OneDrive - Access files anywhere. Create docs with free Office Online.

Last edited by angerdan; 05-14-2021 at 05:32 AM.
05-08-2021, 09:55 AM   #49
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Amazing things to make. This is a very useful compilation. Thanks or the work you put into making this list.


12-10-2021, 04:22 AM - 1 Like   #50
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16. Pentax 560mm lens foot
QuoteOriginally posted by Toolmaker Quote
...what I ended up doing is design a replacement foot for the lens to lower it that 1 1/2" and move the center of the foot to the balance center of the lens with a K-3 mounted to the lens. Whew! That was long winded.
I have the prototype ordered and if that works out I'm curious as to how many others see the need for a replacement foot.
I have an OLD Takamar 500mm lens and what my new 560 foot does (will do) is bring the lens center down to the height of the 500mm. I have added a picture of my design. Please don't steal it.
scroll down the quote to seee the drawing
12-17-2021, 08:44 PM - 3 Likes   #51
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Another addition which I will put up on Thingiverse - Pentax K1000 grip. If the base plates are the same as the KM or KX or K2 it will fit those as well. Given the weight of the camera I thought that it would be useful to have a bit more skin contact so this grip fits the palm and the outer three fingers. I used ABS filament and a higher resolution print setting so there is no flexing but still very light.

(If you download you will need to redrill the tripod hole. The simple program I was using left vestigial infill as the design process developed.)

Last edited by Arjay Bee; 12-17-2021 at 08:48 PM. Reason: more info
07-07-2023, 06:02 AM   #52
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QuoteOriginally posted by Not a Number Quote
I found this little gadget on STLFinder. Only uses the standard battery so you don't get more run time but still could be handy.
External Camera Battery Adapter - STLFinder
External Camera Battery Adapter by walter - Thingiverse
Parts for connecting a Pentax D-Li90 battery through the external power adapter of a K-3, K-5, K-5II, K-5IIs, or K-7.
Uses a Digikey H10485-N HiRose 3-Pos Low Profile connector.


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100mm, 150mm, 31mm, 3d, adapter, batteries, budget, charger, cokin, filter, pentax, phone, pla, print, printer, stuff, tripod, walter
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