CoreXY Laser engraver

thingiverse

Update --------- Check out my update/remix that adds a Z axis and further improvements to this engraver! https://www.thingiverse.com/thing:3123030 Introduction --------------- Some time ago I built a small DVD-Laser engraver but it wasn't really usable. Now this new one became reality by chance. When I upgraded my 3D printer Prusa i3 MK2 to the newer MK2S version I had a few spare parts, namely linear rods and bearings. Additionally, a 1 W blue laser from eBay was lying around unused... this is the result. Disclaimer --------------- This is the obligatory warning. Lasers with such high powers are dangerous and can burn or blind you, even from reflections. Don't attempt to build this if you are not familiar with high power lasers. Good quality laser protection goggles are a must! Don't use cheap ones. Always wear them when working with a laser. Parts List ------------ In addition to the printed parts you'll need the following parts, too. If anything is missing please let me know. Electronics: * 1x Arduino Mega / Uno * 1x Ramps / Arduino CNC Shield * 2x Pololu Stepper driver (A4498, DRV8825, SilentStepStick) * 4x Endstops (Makerbot) * 1x Laser with TTL driver * 1x Power supply (e.g. old ATX) * 1x Fan 12V (for the laser) * 2x Nema 17 stepper motor Mechanics: * 2x 8mm Rod, 370 mm (Y axis) * 2x 8mm Rod, 330 mm (X axis) * 8x LM8UU linear bearing * 16x Ball bearing 625 ZZ * 6x 5mm steel rod, 40 mm * 2x GT2 Pulley, 20 teeth * ca. 4m GT2 belt * 2x Aluminum profile, 30x30 B (8 mm slot), 325 mm * 4x Aluminum profile, 30x30 B (8 mm slot), 150 mm * 2x Aluminum profile, 30x60 B (8 mm slot), 360 mm * 12x Corner mounting brackets 30x30 * M6 T-slot nuts * M6x12 screws * M3x16 countersunk head * M3x16 head cap screw * M3x20 head cap screw * M3x25 head cap screw * TP screws, 2.5 mm (endstops, Arduino mounting, 2.5W laser driver) * M3 square nuts * M3 hex nuts Note: The 5 mm linear rods I bought from eBay to mount the bearings had to be sanded down a bit to fit. Your mileage might vary. Summary --------------- After about a month of testing and tinkering I am quite satisfied with how this thing turned out. There are however a few changes / modifications I will probably implement some time in the future. * Larger working distance The laser is placed quite close to the workpiece. This is not bad as such but unfortunately I have to move the lens so far out that it sits quite loose, probably does not capture the whole beam anymore and one cannot engrave larger objects. * Better end-stop placement I really should have incorporated them at an earlier stage in the design process... * Motorized Z-axis I did not implement it in this design because it would have reduced the work area. Manually adjusting the lens works fine, however, a motorized z axis will make it a lot easier. * Cable chains While these were initially planned I chose to drop it in order to get the engraver done quicker. ChangeLog --------------- * 2019-09-21 Changed license to GPLv3. * 2018-03-29 Uploaded a new laser tool mount for the common 2.5 W blue laser module. * 2018-02-24 Initial upload