The K40 laser cutter is quite a bargain (I paid £350 for mine), but you get what you paid for.
How to use the WEMOS TTGO with the adafruit ssd1306 library.
Sites in China and eBay sell an ESP8266 module with 4MB flash and a build-in 0.91″ monochrome OLED display and a rechargeable battery port.
The module allows to create a minimal WiFi enabled, battery powered system that displays IoT messages.
Updated Arduino Nano Eagle library.
Adding an all-metal extruder to a Prusa i3. The Wade extruder on my i3 started to slip and not enough filament was extruded, so the prints started to look flakier and flakier. I checked the extruder, refurbished the hobbled bolt, but the problem came quickly back. Only once I increased temperature to over 230C (for PLA!) it completed prints – of course the result looked like roasted marshmallows. So I ordered a new J-Head hot end (0.4mm) and a new all-metal extruder. Price on ebay was $175 plus $20 shipping. Quite steep, but I have no regrets! Build quality is excellent and the Nema 11 stepper has plenty of power thanks to the gearbox (at first, I used same driver setting as for my Wade extruder’s Nema 17 and subsequently the stepper would become very hot. Adjusting the reference voltage of the driver board to 0.45V solved the problem). I had to print a new mount to fit the extruder. That was a bit of a challenge, given I own only one 3D printer, and that one was broken. I managed to get one decent print: enough to mount hold the new extruder in place. Once I had the printer re-adjusted (M92 X80.00 Y80.00 Z4000.00 E1333.33), the first task was to print a better mount. Result is attached below. Not sure if it’s the new extruder or the recalibration of the machine (incl. resetting x and z end stops), but now I am finally able to print straight onto glass (using a watered down…
Print you own Nema 23 motor mount. A low cost alternative to aluminium mounts and more accurate than most wooden constructions. Nema motor mounts are usually quite expensive. The quality of the mount does very little to a CNC machine’s accuracy. So I decided to print one. It raises the motor about 2mm above ground. My motors fit snug into the mount hole. The mount is relatively sturdy. I had a bit trouble with warping, since my heated bed didn’t work properly. Thickness of the base can be increased to improve rigidness. For the particular machine I built, 2 mm was al I could afford. Nema23-Mount.skp Nema23Mount.stl