Prusa MKS3 Camera Trigger
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Simple timelapse trigger that fits on the Prusa MKS3 that triggers a DSLR Canon 60D trigger port. I brand it CAM TRiGR
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I wanted to make 3D timelapse printing videos with my Canon 60D camera and my Prusa MKS3. You only need 2 items to make this work, CAM TRiGR and GCode change. I designed a simple trigger switch with a fun trigger tip! You simply place the CAM TRiGR within the reach of the X Drive motor. Then add this G Code to the end of the gcode file in PrusaSlicer. That's it!
Video
;AFTER_LAYER_CHANGE
G1 X5 Y205 F{travel_speed*60} ;Move away from the print
G4 S0 ;Wait for move to finish
G4 P500 ;Wait for 500ms
M42 S255 P73 ;Trigger
G4 P200 ;Wait for 200ms
M42 S0 P73 ;Untrigger
G4 P500 ;Wait for 500ms
;[layer_z]
CAM TRiGR has 4 printed parts.
1. Trigger Frame
2. Trigger Cover
3. Trigger Tip
4. Printer Head Wedge (optional) I double sided taped a small wedge on the printer head side to avoid the "hole" and to help the trigger tip to glide more smoothly. I also sanded the trigger tip a bit with 600 grit sandpaper.
Hardware
1. 2.5mm camera cable
2. "Normally open" micro switch. Switch MUST be "normally open" style.
2.5mm cable https://www.amazon.com/dp/B076DQKDPP?psc=1&ref=ppx_yo2ov_dt_b_product_details
Microswitch https://www.amazon.com/dp/B07P25F2DL?psc=1&ref=ppx_yo2ov_dt_b_product_details
I soldered the yellow wire to the center pole and the red wire to the lower pole. (See picture for details)
The Micro switch has a long lever that needs to be bent over to reach the printer head. (See picture for details) I created several different trigger tips for fun. In fact, you may want to design your own trigger tips!
Trigger Tip Details
1. 25mm to 30mm total length
2. .5mm x 5mm slot for the switch lever
Notes:
1. CAM TRiGR MIGHT work on other DSLR cameras that have a 2.5mm trigger port, I don't have any expereince with other cameras.
2. CAM TRiGR simply clamps onto the X motor drive mount, in case CAM TRiGR feels too loose, I put a small hole that will except a 3mm screw to help clamp the trigger to the X motor mount. You don't need much force. So far I haven't needed to use the screw option.
3. I updated the CAM TRiGR setup with an optional wedge that I taped to the side of the printer head. Helps the trigger tip move more smoothly!