--- # System prepended metadata title: 'frame-proto: Prototype of the frame' tags: [prototype, trolley] --- [![hackmd-github-sync-badge](https://hackmd.io/rrkwL7BRTSuisbxxOud2xg/badge)](https://hackmd.io/rrkwL7BRTSuisbxxOud2xg) # `frame-proto` Prototype of frame :::info (c) Holger Kienle License (if not stated otherwise): [CC BY-SA](https://creativecommons.org/licenses/by-sa/4.0/) ::: :::success :book: Study the [generic frame design](/@kienle/frame-design) to understand the rational for this prototype. ::: [TOC] ## STEMFIE prototype - :exclamation: `s`=12.5mm This 3D printed prototype leverages the [STEMFIE construction set](https://stemfie.org), which is close in spirit to Gridbeam and allows to readily "up-size" the prototype with wooden [square bars](/@hkienle/part-square_bar). The goal for this prototype are to: - get a haptic experience. - represent all joints, especially tri-joints. - represent all beams, screws and bolts (not washers). ![image](https://hackmd.io/_uploads/S1Iqlkd1gx.png =x200) ![image](https://hackmd.io/_uploads/SkRBfkdJex.png =x200) *Left: 3D printed frame.* *Right: Parts used. (2 beams are not to scale.)* ### Deficiencies of the prototype - The height (beams ![](https://img.shields.io/badge/2x-leg--back-light.svg)) is not modeled to scale because of size limits of the 3D printer (and to save on filament and print time). - The wheel mount can not be readily transferred to a full-scale design (but may come close to a possible solution for larger beam profiles such as `frame-20x20`). ![image](https://hackmd.io/_uploads/BkfmbJO1ge.png =300x) *Wheel mount of the prototype: Axle goes through beam* ## 3D-print (`mfg`) ![2025-04-17_18-05-29_screenshot](https://hackmd.io/_uploads/S1TpLxT1Zl.png) *Build plate (Prusa XL with two 38-hole beams).* :link: https://www.printables.com/model/1477630-osh-trolley-proto-frame-stemfie-buildplate ## BOM (`mfg`) :construction: Needs better formatting. ### Individual [STEMFIE Parts](https://get.stemfie.org) - Beams - Straight - Standard - Square Ends https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/ - Fasteners - Shoulder Screws - Rounded Head https://get.stemfie.org/Fasteners%20-%20Shoulder%20Screws%20-%20Rounded%20Head/ - Fasteners - Nuts - Threaded - Open https://get.stemfie.org/Fasteners%20-%20Nuts%20-%20Threaded%20-%20Open/ - Fasteners - Retaining Rings https://get.stemfie.org/Fasteners%20-%20Retaining%20Rings/ - Power-transmission - Hub - Plain - Indexing - Free https://get.stemfie.org/Power-transmission%20-%20Hub%20-%20Plain%20-%20Indexing%20-%20Free/ - Shafts - Indexing https://get.stemfie.org/Shafts%20-%20Indexing/ - Wheels - Ground - Treaded - Plain https://get.stemfie.org/Wheels%20-%20Ground%20-%20Treaded%20-%20Plain/ ### Parts to print - 2x (+2x) Spacer FRE BU01.00x00.25 - SPN-SPR-0050 - https://get.stemfie.org/Fasteners%20-%20Spacers%20-%20Free/Spacer%20FRE%20BU01.00x00.25%20-%20SPN-SPR-0050%20(stemfie.org).stl - 2x Shaft IDX BU03.25 - SPN-SFT-0133 - BU3.25 (13 holes) https://get.stemfie.org/Shafts%20-%20Indexing/Shaft%20IDX%20BU03.25%20-%20SPN-SFT-0133%20(stemfie.org).stl - 4x Retaining Ring SFT LCT RDL TRH-H ASYM - SPR-RRG-0001 BU01.00x01.25 - https://get.stemfie.org/Fasteners%20-%20Retaining%20Rings/Retaining%20Ring%20SFT%20LCT%20RDL%20TRH-H%20ASYM%20BU01.00x01.25%20-%20SPR-RRG-0001%20(stemfie.org).stl - SYM (vs. ASYM) https://get.stemfie.org/Fasteners%20-%20Retaining%20Rings/Retaining%20Ring%20WSR%20LCT%20RDL%20TRH-H%20SYM%20BU01.00x01.25%20SPR-RRG-0002%20(stemfie.org).stl - 2x Power-Transmission Hub PLN IDX FRE BU01.00 - SPN-PTH-0103 - BU1.00 (4 holes) https://get.stemfie.org/Power-transmission%20-%20Hub%20-%20Plain%20-%20Indexing%20-%20Free/Power-Transmission%20Hub%20PLN%20IDX%20FRE%20BU01.00%20-%20SPN-PTH-0103%20(stemfie.org).stl - 2x Wheel GND TTRD PLN BU05.00x01.00 - SPN-WHL-0013 - BU5.00 https://get.stemfie.org/Wheels%20-%20Ground%20-%20Treaded%20-%20Plain/Wheel%20GND%20TTRD%20PLN%20BU05.00x01.00%20-%20SPN-WHL-0013%20(stemfie.org).stl - 18x Nut RH BU01.00x5mm - SPN-NUT-0001 - 5.00mm https://get.stemfie.org/Fasteners%20-%20Nuts%20-%20Threaded%20-%20Open/Nut%20RH%20BU01.00x00.50%20-%20SPN-NUT-0003%20(stemfie.org).stl - 3.12mm https://get.stemfie.org/Fasteners%20-%20Nuts%20-%20Threaded%20-%20Open/Nut%20RH%20BU01.00x00.25%20-%20SPN-NUT-0002%20(stemfie.org).stl - 6.25mm https://get.stemfie.org/Fasteners%20-%20Nuts%20-%20Threaded%20-%20Open/Nut%20RH%20BU01.00x5mm%20-%20SPN-NUT-0001%20(stemfie.org).stl - 18x Shoulder Screw RH RHD BU02.00 - SPN-SSC-0048 - https://get.stemfie.org/Fasteners%20-%20Shoulder%20Screws%20-%20Rounded%20Head/Shoulder%20Screw%20RH%20RHD%20BU02.00%20-%20SPN-SSC-0048%20(stemfie.org).stl - 2x Beam STR STD ESS BU02x01x01 - SPN-BEM-0039 - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU02x01x01%20-%20SPN-BEM-0039%20(stemfie.org).stl - 2x Beam STR STD ESS BU07x01x01 - SPN-BEM-0044 - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU07x01x01%20-%20SPN-BEM-0044%20(stemfie.org).stl - 2x Beam STR STD ESS BU12x01x01 - SPN-BEM-0049 - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU12x01x01%20-%20SPN-BEM-0049%20(stemfie.org).stl - 2x (+1x) (+2x) Beam STR STD ESS BU17x01x01 - SPN-BEM-0054 - +1x: extra beam for more stability of platform - +2x: **not too scale** beam (17 holes instead of 38 or 41 holes) - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU17x01x01%20-%20SPN-BEM-0054%20(stemfie.org).stl - 2x (-2x) Beam STR STD ESS BU41x01x01 - SPN-BEM-0078 - -2x: when using **not too scale** beam with 17 holes - to scale (41 holes) - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU41x01x01%20-%20SPN-BEM-0078%20(stemfie.org).stl - max. size for **Prusa XL** printer (38 holes) - https://get.stemfie.org/Beams%20-%20Straight%20-%20Standard%20-%20Square%20Ends/Beam%20STR%20STD%20ESS%20BU38x01x01%20-%20SPN-BEM-0075%20(stemfie.org).stl ## Add-On: Board - The board is thin to save on print time and filament. ![image](https://hackmd.io/_uploads/S11VtJbe-g.png =x200) ![image](https://hackmd.io/_uploads/r1cmQx-lZg.png =x200) *Board with mounting screws.* :link: https://www.printables.com/model/1477756-osh-trolley-proto-board-stemfie-buildplate ## Related resources See also [:de:OSHOP proposal](/@hkienle/einkaufstrolley-oshop#Grundgerüst).