[](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).

*Left: 3D printed frame.*
*Right: Parts used. (2 beams are not to scale.)*

### Deficiencies of the prototype
- The height (beams ) 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`).

*Wheel mount of the prototype: Axle goes through beam*

## 3D-print (`mfg`)

*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.

*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).