Kid Mendel

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Kid Mendel

Release status: experimental

KM sans XZ axes.jpg
Description This is a highly configurable Mendel derivative built by Jungseo Park with a aesthetically simple look, driven by high-speed leadscrews.
License GPL
Author jspark,evamvid(documentation)
Contributors
Based-on Mendel
Categories Mendel, Prusa Mendel
CAD Models
External Link http://www.thingiverse.com/jspark/designs/


The Kid Mendel is a printer designed by Thingiverse user JSPark, in South Korea. It is called the Kid Mendel for two reasons:

  1. The printer is an aesthetically simpler version of the Mendel or Prusa Mendel designs...
  2. Because of its simplicity, it is a good printer to use when introducing 3d printing to children.

Contents

Design

The printer follows in the footsteps of the Sells and Prusa Mendels; The extruder moves in X and Z, and the bed moves in Y. There are working Y Ends for both lead screw and belt driven. The Z axis is leadscrew driven as well.

The reason for all the alternative linear motion systems is preference and availability. Timing belts are hard to come by in some countries, and the quad-start high speed leadscrews specified for the printer are not available in the US.

The original design uses linear stepping motors; these are steppers that have a leadscrew machined onto the shaft. These are referred to as "leadscrew" or "leadscrew drive" through the rest of the page.

The other drive train options are threaded rod drive, belt drive, and threadless ball screw drive.

A leadscrew drive has been completed for the X axis

A belt drive has been completed for the Y axis. A threadless ball screw drive has been completed, but not tested, for the Y axis. A leadscrew drive has been completed for the Y axis.

A leadscrew drive has been completed for the Z axis.

For the threaded rod drive option, you can use Acme leadscrews, as long as the diameter of the rod is the same, and the nuts fit. Support may be added for Acme nuts in the future, but it is not a priority.

RP Parts

The bar clamp that holds the smooth and threaded rods is the same as the Prusa Mendel's....

Quantity STL file Comments Picture Link
8 Bar Clamp Part taken from Prusa Mendel Design; This number is unconfirmed I2-bar-clamp.png
1 X Motor End For Leadscrew Drive X End Motor.jpg
1 X Idler End For Leadscrew Drive X-Idler.jpg
1 X Carriage For Leadscrew Drive X Carriage.jpg
1 Y Motor End For Leadscrew Drive KM Y Motor End.jpg
1 Y Idler End For Leadscrew Drive KM Y Idler End.jpg
2 Leadscrew Backlash-Adjusting Nut On the Y axis;Two of these are held by an LM8UU Holder; For Leadscrew Drive KM Backlash Nut in Holder.jpg
1 Y Motor End For Belt Drive KM Y Motor End Belt Drive.jpg
1 Y Idler End For Belt Drive KM Y End Idler Belt Drive.jpg
1 Y Motor End For Threadless Ball Screw Drive KM Y Motor End Belt Drive.jpg
1 Y Idler End For Threadless Ball Screw Drive KM Y End Idler Belt Drive.jpg
1 Threadless Ball Screw,JSPark derivative On the Y axis, for Ball Screw Drive KM Z Motor Holder.jpg
2 Z Axis Motor Holder KM Z Motor Holder.jpg
6 Frame Vertex Uses one type of vertex for the top and the bottom, instead of the classic footed/non-footed varieties KM Frame Vertex.jpg
 ?? M8 Nut Cap Open Style This number is unconfirmed KM M8 Nut Caps.jpg
~26 M8 Nut Cap Closed Style This number is unconfirmed KM M8 Nut Caps.jpg
6 Printed LM8UU This number is unconfirmed; it is recommended that you print these in PLA, and print spares for when they wear out KM Printed LM8UU.jpg
6-7 LM8UU Holder Use Ver. 2;This number is unconfirmed;Use 6 for Threadless Ball Screw Y axis, use 7 for Leadscrew Y axis KM LM8UU Holder V2.jpg

Bill of Materials

Under Development!!

To use this BOM, mix and match. Choose the drive you plan to use on each axis, and add the vitamins until you have a complete list.

Y Axis

Belt Drive
Leadscrew Drive
Threaded Rod Drive
Threadless Ball Screw Drive
Quantity Description Comments
Fasteners
4 M3x5mm Screws This number is not yet stable; These are used for mounting the motors
20 M3x10mm Screws This number is not yet stable
4 M3x17mm Screws This number is not yet stable
6 M3x25mm Screws This number is not yet stable
13 M3 Washers This number is not yet stable
30 M3 Nuts This number is not yet stable
Rods
Smooth rods can be cut from a 1m length of rod
1 300mm 8mm Smooth Rod This number is not yet stable
1 260mm 8mm Smooth Rod This number is not yet stable
Bearings
1 608ZZ Roller Bearings This number is not yet stable
3 623 Roller Bearings This number is not yet stable
3 LM8UU Linear Bearings This number is not yet stable; Only if you prefer real bearings to printed bushings

X Axis

Belt Drive
Leadscrew Drive
Threaded Rod Drive
Threadless Ball Screw Drive

Z Axis

Leadscrew Drive
Threaded Rod Drive
Threadless Ball Screw Drive

Upcoming Development

  • Option for seperate lead screws
  • Option for Threaded Rod XYZ axes
  • Complete BOM section of this page
  • Update RP section of this page for Threadless Ball Screw Y axis


The original motors used are hard to source for many parts of the world; the leadscrew is attached to to the motor, instead of using a printed or machined coupler. A known source for these for those in South Korea is http://www.motorbank.kr/shop/goods/goods_view.php?goodsno=2854&category=006006