Summary

Stepper-driven pointer with continuous rotation: the steppers are fixed so no cable tangles.

Print Settings

Printer:

Mini Kossel

                                            <p class="detail-setting rafts"><strong>Rafts: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting supports"><strong>Supports: </strong>                     <div><p>No</p></div></p>                                                                                <p class="detail-setting resolution"><strong>Resolution: </strong>                     <div><p>0.2/0.3</p></div></p>                                                                                <p class="detail-setting infill"><strong>Infill: </strong>                     <div><p>any</p></div></p>                                                    <strong>Filament:</strong> Random PLA PLA                White                    <br>                        <p class="detail-setting notes"><strong>Notes: </strong>                    </p><div><p>Should print without additional supports (support in one place is built in)</p><p>Bearings: Uses 6x 624zz bearings (6mm shaft diameter)</p><p>Belts: Uses 2x 200mm length, 6mm wide GT2 belts</p><p>Machine Screws: Assorted M3 machine screws &amp; grub screws</p><p>Shafts: 3x 6mm shafts: ~120mm, ~75mm &amp; 300mm (depending on how long you'd like the pointer). I used 6mm carbon fibre rods that I had laying around.</p><p>Pulleys: 2x 20t GT2 pulleys, can be metal or printed from <a rel="nofollow" href="/thing:11256">https://www.thingiverse.com/thing:11256</a></p><p>Bevel Gears: 2x 45 deg 1:1 bevel gears, fixing holes drilled M2.5 and tapped M3 to accept 6mm M3 grub screws. I bought these from RS Components (stock no 521-6058, <a rel="nofollow" href="https://uk.rs-online.com/web/p/mitre-bevel-gears/5216058/?sra=pstk">https://uk.rs-online.com/web/p/mitre-bevel-gears/5216058/?sra=pstk</a>) - check how much you can buy bevel gears for before you decide to make this, they are not cheap</p></div>

How I Designed This

Built in OpenSCAD

            <div><p>*.scad file is included</p><p>60 tooth pulleys are adapted from pulleys generated from <a rel="nofollow" href="/thing:11256">https://www.thingiverse.com/thing:11256</a></p></div>

Continuous Rotation Pointer