Riki200

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Revision as of 10:32, 29 May 2017 by Lkcl (talk | contribs) (Hardware Specifications)
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Sandwich200

Release status: design

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Description
A fast, accurate aluminum-framed printer with a 200x200x220mm print area using an experimental XY arrangement based on an old Rikadenki scientific plotter.
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CAD Models
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Introduction

The Riki200 is a high-accuracy high-speed experimental 3D printer that uses 2020 aluminum extrusion frame.

Goal

To design a fast, accurate and affordable portable 3D printer using experimental plotter kinematics that offers high speed and quality. The printer must be able to be built without specialized tools, and must be completely rigid when assembled.

Features

  • Ultimaker2-style panel arrangement
  • Minimal Aluminum structure 20x20mm extrusion for supporting rails
  • Triple lead screws and dual rails to provide guaranteed absolute rigidity.
  • Rikadenki "plotter" arrangement using rails and v-rollers for both X and Y, doubling the accuracy (pulley effect) https://capolight.wordpress.com/2012/04/14/old-school-scientific-pen-plotter-teardown/
  • 200x200x220mm build area with heated bed
  • All hardware and electronics (except for filament spool) are integrated within the frame.
  • Capable of 0.05mm layer height and 400 mm/s printing
  • Emphasis on using 3D-printed parts and being easily hackable/upgradeable
  • Flex3Drive to provide *more* than the best of both direct-drive and bowden worlds
  • Flex3Drive and an E3Dv6 "volcano" set gives very high flow-rates
  • Low moving mass — all motors stationary.
  • No specialized tools or equipment necessary for assembly (accessible)
  • Linear rails to avoid unnecessary play due to machining tolerances

Hardware Specifications

  • 24v low-profile 350W PSU
  • 3mm Aluminium MK3 214x214 printbed
  • Duet 0.8.5 electronics (high current stepper drivers, up to 30V)
  • 84ozin (60Ncm) 200steps/rev 2.5A NEMA17 Stepper Motors (QTY 4)
  • E3Dv6 3.0mm Bowden hot-end with "Volcano" upgrade and 0.4mm nozzle (up to 1.2mm available)
  • Flex3Drive flexible driveshaft with a 40:1 wormdrive and a MK8 filament drivegear.

Design sketches

Simple sketch of Carriage layout

Analysis

Bill of Materials

The BOM is maintained in the source for the CAD model, and is auto-generated (including an accurate count of nuts and bolts required). A copy is here: http://hands.com/~lkcl/riki200/riki200_bom.pdf

Printed Parts

The STL files are auto-generated from pyopenscad (included in the source). Recent copies may often be obtained here: http://hands.com/~lkcl/riki200/scad/stl/ and http://hands.com/~lkcl/riki200/pulley/ (GT2-6mm-50T.stl). Full source is obtained with git clone http://hands.com/~lkcl/riki200/.git/ Build requirements: install git, GNU make, python2 and a recent version of openscad. run "make download" followed by "make".

Tools

Recommended: obtain a small geared power drill or a screwdriver with a standard hexagonal toolbit adapter: there are an enormous number of M3 nuts, bolts and screws to assemble (over 300)

  • 1/4in (6.5mm) M3 hex nut/bolt socket: narrow / long type. OD must be no greater than 8mm, extending for at least 10 to 12mm.
  • Allen keys: 1.5mm, 2.0mm, 3.0mm, 4.0mm (these are for the MK8 drive gear, GT2 gears, etc. - get 2 of the smaller ones because they tend to wear out)
  • Screwdrivers: electrical (for the EC), flat-head and/or pozidrive (for M3 screws)
  • M3 spanner(s), adjustable spanner(s), or Pincer-nosed pliers with small eye for nuts (M3) (Qty 2 recommended)
  • Another 3D printer capable of 0.20mm layer height (your own or use someone else's)
  • Keyfile set (round, square, flat, arc, triangular etc.) and small Craft knife (for trimming 3D parts: keyfiles can also be useful for filing inside extrusion ends, so that M3 hex nuts fit properly)
  • Method for cutting extrusions to length (see below)
  • Wood saw (if choosing MDF, Plywood or Hardboard for the box sides). Obtaining the panels cut-to-order is recommended (most iromongers / hardware stores can do this for you)
  • Soldering iron, solder, stand and sponge (usual deal for soldering)

Development

Discussion on the reprap forum is here: http://forums.reprap.org/read.php?177,767087

Version 1.0

Initial variant.

Gallery

A photo gallery is maintained here:

Videos

Revision 1.0

References