Tentaku Mechanical DIY Kit Planning Guide
A Tentaku style build is small, but it still needs careful planning. The calculator above helps you price the main kit, switches, keycaps, power parts, tools, shipping, tax, and spare parts. It also adds a labor value when you want to compare cash cost with real project effort.
Why Budget Before Building
DIY calculator kits often look simple at first. The hidden cost appears when you add preferred switches, custom caps, solder, batteries, case upgrades, and delivery fees. A budget gives you a clear buying target. It also helps you decide whether premium parts are worth the extra money.
Important Build Inputs
The base kit price is the starting point. Switch quantity and switch price estimate the keyboard feel cost. Keycap cost covers number pad caps and larger keys. Tools and supplies can include solder, flux, tweezers, cutters, and cleaning items. Shipping and tax complete the purchase estimate. Spare percentage is useful because small parts can be damaged or misplaced.
Formula Logic
The calculator first adds every direct part cost. It then adds a spare allowance. Tax is applied after the allowance, because many buyers treat extra parts as part of the order. Shipping is added at the end. Labor value is separate, so you can see both actual cash spending and total project value.
Better Buying Decisions
Use the result to compare budget, balanced, and premium builds. A low switch price may keep the project affordable. Better switches may improve feel and sound. A larger spare allowance is helpful for first-time soldering practice. Experienced builders may use a smaller allowance.
Practical Assembly Notes
Check the parts list before soldering. Dry fit switches, stabilizers, and keycaps. Confirm battery type and display placement. Work slowly and test often. Keep screws and spacers in a tray. Clean the board after soldering. These simple steps reduce mistakes and protect the finished calculator.
Using the Results
Save the CSV for spreadsheets. Download the PDF for a workshop record. Review cost per key and build value before ordering. Then adjust inputs until the plan matches your budget and skill level. Repeat the estimate after choosing parts, because small upgrades change the total faster than expected for any careful maker.