What problems can occur when hand fitting?

Hand fitting can lead to several problems, including inconsistencies in dimensions and tolerances, which may result in parts not functioning correctly together. Additionally, it can cause increased wear and tear on components due to improper alignment or uneven pressure distribution. The process is also time-consuming and may lead to fatigue or human error, further compounding issues in assembly or operation. Lastly, it may not scale well for larger production runs, impacting overall efficiency.