Its a very sticky business with limited profit pool (therefore limited competition), and is a very good proxy to industrial growth. The delta in terms of growth in this sector is low as most printing is because of regulatory requirements and each competitor is quite good. This means that once a factory installs a printer on a production line, it will not change the supplier unless something goes very wrong. So, gaining competitor accounts is not easy and you need to have newer lines to penetrate into the customer.
About guidance, management didn’t guide 400 cr. in FY22 but by FY25. Growth wise, they have executed very well gaining accounts in newer sectors where they were not present before. Also, they are doing these small acquisitions (like Innovative Codes last year, Markprint recently) to increase potential market size. Additionally, company is investing in software vertical as they want to be a complete service provider (e.g. in pharma division, they have come up with QR code that tracks production batches which is implemently directly by Control Print instead of the pharma company). So, I feel management is trying very hard to unlock new growth avenues.
If you have any specific question, please feel free to ask. Hope this helps 
Disclosure: Invested (position size here, no transactions in last-30 days)