LowRider 3 CNC - Add-on - KINEMATIC Pen Holder - designed for LR3 Dust Shoe (v4.1)

prusaprinters

This is made to go with the LowRider v3 CNC - KINEMATIC Tool-less Quick-Change Accessory Holder - supports laser, drag knife, pen, etc (v4.1). NOTE: July 28, 2023 — Consider adding some kind of spacers (could be washers or printed spacers) between the Kinematic Mobile Mount and the Pen Mount itself. This gives the pen holder space so it does not catch and hangup on the Kinematic Mobile Mount. Kudos to V1E forum member Jonathan Jones (@Jonathjon) for catching this and pointing it out. Below are photos of that in action, using washers as the spacers: NOTE: June 8, 2023 — improved new release, v4.1, accomplishes two goals: The pen is located closer to the center point of the LR3's router (less offset from the cutting bit)The offset distance is equal in both X and Y axes: ~52.043 mm for each. That's from the center of the router bit to the edge of the mount where the side of the pen rests. To calculate your actual offset, be sure to add on the radius of your pen body. See example below. (For anyone curious, the 45-degree diagonal measure of offset from router bit center to the edge of the holder where the pen body rests, is ~73.6mm.) Having X and Y offsets be equal hopefully makes it a bit easier to handle coordination between drawing and cutting in the same project. (Note: prior to May 14, 2024, the example graphic had an incorrect method of calculation. As of that day I caught the error and fixed it.)IMPORTANT ASSEMBLY TIP:Insert your two zip ties through the pen holder, before attaching the pen holder to the Mobile Base from the linked other listing!Diagrams showing the X & Y offsets, and an illustration of calculating offset with a common Sharpie marker:Note: You can also use the same formula to calculate offset when your pen is a different diameter, or if you have altered the diagonal offset by use of washers/spacers, etc. Here's how it's calculated:Diagonal offset of the Kinematic Pen Holder, when no pen is present (from center of LowRider's router bit): 73.6 mm+ Radius of a Sharpie pen: 6.14 mm- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Total diagonal offset with Sharpie pen: 79.74 mm Using the Pythagorean Theorem (a² + b² = c²) we know the hypotenuse, so we can work backwards to get the sides. Since we know a = b (i.e. also a² = b²), we can rewrite the equation as: a = c/√2or: a = 79.74/√2So:X offset = 56.38469473 Y offset = 56.38469473PS: in a cell in a Microsoft Excel spreadsheet, the final formula is written as:= 79.74/ SQRT(2) Here's a helpful video I made about this (the video shows older v4.0): OTHER COMPATIBLE TOOL HOLDERS INCLUDE:NEW (2023-08-22): Air Mist Mixer Mount: https://www.printables.com/model/560988-lowrider-3-cnc-add-on-kinematic-air-mist-mount-for Laser mount for NEJE A40640 Diode Laser: https://www.printables.com/model/485419-lowrider-3-cnc-add-on-kinematic-laser-mount-v40-de Pen Holder, not inverted, v4.0 - generic design for pens on LR3 Dust Shoe, made for this v4.0 kinematic system: https://www.printables.com/model/489020-lowrider-3-cnc-add-on-kinematic-pen-holder-v40-gen Drag Knife Holder v4.0 - 1.0mm spring leaf (for drag knife such as sold by V1 Engineering): https://www.printables.com/model/489040-lowrider-3-cnc-add-on-kinematic-drag-knife-holder- Print, attach to the Mobile Base in the listing above, using three (3) screws and nuts, M3 x 16mm.Install a pen using zip ties. Attach this and its Mobile Base to the Fixed Base on the LowRider v3, and draw something. Post results in the comments here. Change log:May 14, 2024 — Corrected the calculation of the X and Y offset when a Sharpie pen is in the holder (X and Y offset from center of the cutting bit of the LowRider to the center of the Sharpie pen). Updated graphic with this info. June 8, 2023 — improved new release, v4.1. See above.May 18, 2023 — initial release, labelled v4.0 (because so many previous mixes). My PayPal tip jar: https://paypal.me/design8studio   Various LowRider 3 CNC remixes:LowRider 3 CNC Collection View all my models and remixes on Printables:Design8Studio 3D models *Amazon product links are affiliate links.