LR (LabRat) 3D Printer. 3d printer intended at first to test different mechanical parts and firmware proved to print decently to be used as learning printer or backup printer. I like to test any upgrade before implementing it but I feel uncomfortable to do this on a calibrated printer so I designed this printer and used parts laying around after upgrading both main printers. Main features:

• as simple as possible;
• easy to assamble and disassamble;
• configurable according to desired dimension and/or available components. Can be configured for any square or rectangle bed below 200x200 mm and, why not, upgradable to I3 configuration LR 2.5;

As my both printers are wheels based the adopted solution was simple. For the base frame I used 2020/2040 european aluminium profile 5mm slot. Can be used any type. For the X/Y/Z axis V-slot profile. For tapping the extrusions holes ( M6x10 and M5x10 screws) I used an actual screw with chamfered tip and 2020 Extrusion Thread Tapping Jig. For X/Y carriages I remixed Improved X-carriage by Nystao . There are 2 variants for X carriage : for Anet (E10/E12) and for Creality (Ender, CR10). Wheels axis M5x30 screws X and Extruder motor holders : solution used at Anet E10/E12 (inside wheel under x axis) and wheel tensioner with custom printed eccentric. Wheels axis M5x45mm. For all Wheels I used 8mm spacers. Mine bed is the weakest link: 180x180mm, 120x120 silicon 12V heating pad and cork sheet and only 1.6mm aluminium sheets (Should be used thicker aluminium plates but I did not have). Bed leveling knob
Endstops - all are adjustable. I used only the microswitch from Reprap endstops. For Z Compact Opto Servo Probe . X/Y belt tensioners: fessyFOO's Yet Another Belt Tensioner or any other belt tensioner for 2020 profile. Extruders: I used original Ender 3 extruder with gearbox for standard bowden extruder, and Pitan extruder Firmware : Marlin 2.0 for Ender 3 except of course bed dimensions, x/y offsets, board and display. All parts printed in PLA.

It was my playground for about six months testing opto-servo probe, Pitan, Drakon and gearbox extruders, SKR 1.1, SKR 1.3 and Anet 1.0 boards. In "Thing Files" I added a 3mf file for 3d view of assembly (in 3d builder for Windows 10 users). It's designed in Designspark Mechanical free and export as STEP format is not available.

Printed things:

• Vibration a.k.a. ripple a.k.a. shadow a.k.a. ghosting test - https://www.thingiverse.com/thing:277394
• Cali Cat - https://www.thingiverse.com/thing:1545913
• 3D Benchy- https://www.thingiverse.com/thing:763622
• Spiral Sphere Ornament - http://www.thingiverse.com/thing:3265323
• Christmas Tree Light - https://www.thingiverse.com/thing:2670306

09.01.2020 replaced in STL.zip "Y carriage.stl" 11.04.2020 updated in STL.zip "E motor holder.stl" and "Eccentric.stl" 01.05.2020 added Confiduration.h and Configuration_adv.h, Marlin 2.0 18.06.2020 added 2040 profile for Y axis configuration. Use Y carriage 3 or 4 wheels , Y motor mount and corner brackets from LR 2.5 3D printer. 13.03.2021 added Z carriage 4 wheels and angled extruder holder. LR V3.3mf Y,Z 4 wheels, 220x220 bed

For more pictures and videos https://photos.app.goo.gl/PNfaTJG17P3fEyeN6