FERM CDM1188 Direction Switch Slider Replacement

2) Short Description

Replacement slide switch for the forward/reverse selection on the FERM Li-Ion screwdriver CDM1188. Version v4 with Snap-Fit-Clip, which locks onto the transverse bar in the housing so that the part really holds.

3) Description (long)

Problem: The original direction slider (forward/reverse) tends to break off.
Solution: This 3D-printed replacement is designed not only to fit visually but also to firmly snap into place via a clip mechanism on the transverse bar in the housing. This ensures the slider remains securely guided and can be operated smoothly in both directions.

Compatibility

• FERM Li-Ion Screwdriver Art. No. CDM1188 (Directional Switch / Forward-Reverse Slider)
• Note: Tolerances may vary minimally depending on the production batch.

Features

• Snap-Fit-Clip for the internal transverse bar (secure hold)
• Print-optimized for FDM
• Functional part: robustly designed (PETG recommended)

Disclaimer
Not an original part, no connection to FERM. Use at your own risk. Before assembly, remove the battery and safely check functionality.

4) Print Settings (recommended)

Material: PETG (recommended), PLA only as a prototype/emergency solution
Layer height: 0.16 mm
Walls/perimeter: 4
Infill: 100%
Supports: ON (min. „Touching build plate“)

• Optional: Place supports only in the area of the clip lips (if you „paint“ cleanly)

Orientation: As intended in the 3MF (arrows up)

5) Post-Processing / Tuning

If the clip…

• is too tight: In Bambu Studio XY compensation / Horizontal Expansion +0.10 to +0.20 mm or deburr minimally.
• is too loose: −0.10 mm or scale minimally (100.5–101%).

6) Assembly (short & clear)

1. Insert the slider from the outside, aligning it so that the clip hits the inner transverse bar.
2. Carefully press until it clicks into place.
3. Switch left/right multiple times and check: smooth travel, no jamming, no „intermediate state“.
4. Only then use normally again.

This is an unofficial, fan-made 3D model (fan art). All rights to the character, design, and associated franchise depicted belong solely to the original creators, rights holders, and publishers. This model was created out of pure fan passion and is intended exclusively for private, non-commercial use. Selling these 3D files or the resulting physical models is not permitted.

🧩 Quality & Feedback
• Please post a "Make" with a photo – this helps others and improves visibility.
• Feedback/Issues: Briefly state: Printer, material, layer height, temperature, photo of the problem area.

📄 License / Usage
• Private use according to the model license.
• Commercial use (sales/shop/production) only with an appropriate commercial license membership.

🛠️ Troubleshooting (Briefly)
• Stringing: Lower temperature slightly + check retraction/travel.
• Elephant's foot: Reduce first layer flow/temperature or use Elephant-Foot Compensation.
• Connector too tight: Check calibration/flow, do not scale; if necessary, lightly sand.

My Setup – for a better overview and as a transparent insight into my current equipment. This is how my personal work and technology setup is presented.